ANALYTICAL CONSIDERATION ON SEISMIC BEHAVIOR OF EARLY SHOWA PERIOD BILLBOARD ARCHITECTURE BASED ON FACTUAL INVESTIGATION AT CHUO-3, OTA CITY

DOI Web Site Web Site 2 References
  • TAKIYAMA Noriko
    Dept. of Architecture and Building Eng., Tokyo Metropolitan Univ.
  • IDATE Naoto
    Dept. of Architecture and Building Eng., Tokyo Metropolitan Univ.
  • CHEN Xinyan
    Dept. of Architecture and Building Eng., Tokyo Metropolitan Univ.
  • SANUKI Ryo
    Dept. of Architecture and Building Eng., Tokyo Metropolitan Univ.
  • GONDO Tomoyuki
    Dept. of Architecture, Univ. of Tokyo
  • MATSUMOTO Masumi
    Dept. of Architecture and Building Eng., Tokyo Metropolitan Univ.
  • AOKI Shigeru
    Dept. of Architecture and Building Eng., Tokyo Metropolitan Univ.

Bibliographic Information

Other Title
  • 大田区中央三丁目における実態調査に基づく看板建築の地震挙動に関する解析的考察
  • オオタク チュウオウ サンチョウメ ニ オケル ジッタイ チョウサ ニ モトズク カンバン ケンチク ノ ジシン キョドウ ニ カンスル カイセキテキ コウサツ

Search this article

Abstract

 The seismic retrofitting of old constructions is important in earthquake-prone countries. There are areas in Tokyo, Japan with Densely Built-up Wooden House Areas. These regions face the serious task of building seismic resistance and/or fireproof properties in the buildings in the entire area. Thus, studies related to ensuring the soundness and stability of the city and its buildings, are necessary, not only for disaster prevention but also for urban planning and community revitalization.<br> Early Showa period billboard architectures, named by Prof. T. Fujimori, constructed in downtown Tokyo after Great Kanto earthquake of 1923. They are a type of residential housing with an integrated store. They are wooden residences with a mortar wall or sheet copper, which combined billboard, located only at the front of the building. They may have two problems. The first problem centers on the assumption that the stiffness of the billboard wall is higher than that of the remaining wooden frames. Thus, the eccentricity of the entire building may be greater than that of a typical wooden structure because of maldistribution of the earthquake-resistant elements. Secondly, it is feared that there are fewer earthquake-resistant columns and walls on the ground floor behind the billboard wall because the ground floor is a store. It is very important to understand their seismic behavior, aiming to preserve the old townscape along old shopping streets and to utilize the billboard architectures.<br> In this paper, we research on seismic behavior of the billboard architectures in Chuo-3, Ota City with Densely Built-up Wooden House Areas. First, we conducted an exhaustive survey of 809 buildings and roads, and microtremor measurements on the ground at 25 points in the area. Next, measuring the dimensions of the billboard architectures, standard analysis models were constructed. We conducted seismic response analysis to evaluate response characteristics. Lastly, eigenvalue analysis to evaluate their respective vibrational properties, such as the natural frequency and vibrational mode. After that, sensitivity analyses were conducted on the floor rigidity or materials of the walls.<br> The major findings from this study are summarized as follows: (a) The buildings in the area divided into geographic sections were densely packed. There were early Showa period billboard buildings along the local traditional shopping street. Nearly 80% of all billboard buildings were located 1 m or less from the frontal road. (b) H/V spectrum on ground changed gradually from the west to the east. The peak of the natural frequencies can be specifically determined in the west side, but the peak value gradually disappears toward the east. (c) The first story exhibited the maximum story deformation angle along the frontal plane of the billboard. Additionally, the story deformation angle of the first story significantly differed from that of the second story. This is because there are fewer earthquake-resistant elements built into the first story and because the second story has a thick billboard wall. The amplitude differed between wooden structures and the billboard. This is because the eccentricity of the entire building may be larger than that of the typical wooden structure. (d) Supposing repair work, sensitivity analyses were conducted on the structural model to evaluate the vibrational properties of billboard architecture. Within the limits of our research, balance is good when stiffness is designed in close value between floor above and below.

Journal

References(2)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top